iOS实现UITableView左滑删除复制即用功能

//设Cell可编辑- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath{  return YES;}//设置删除按钮-(UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath{  return UITableViewCellEditingStyleDelete;}//进入编辑（删除）模式-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{    //出现alterView隐藏删除按钮  [tableView setEditing:NO animated:YES];  if (editingStyle == UITableViewCellEditingStyleDelete) {    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"你确定删除该消息？" preferredStyle:UIAlertControllerStyleAlert];    [alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]];    [alertController addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {      //需要先删除数据源中对应数据，不然执行下一步会崩溃      [reconnaissanceListArr removeObjectAtIndex:indexPath.row];      [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];    }]];    [self presentViewController:alertController animated:YES completion:nil];  }}//修改编辑按钮文字-(NSString *)tableView:(UITableView *)tableView titleForDeleteConfirmationButtonForRowAtIndexPath:(NSIndexPath *)indexPath{  return @"删除";}//设置进入编辑状态时，Cell不会缩进- (BOOL)tableView: (UITableView *)tableView shouldIndentWhileEditingRowAtIndexPath:(NSIndexPath *)indexPath{  return NO;}